Get Programming with JavaScript - Listing 6.05

Get Programming with JavaScript - Listing 6.05

Listing 6.05 - A function with three arguments

var totalCost;

totalCost = function (callOutCharge, costPerHour, numberOfHours) {
    return callOutCharge + costPerHour * numberOfHours;
};

console.log("$" + totalCost(30, 40, 3));

Further Adventures

Listing 6.05 - A function with three arguments - Task 1

What is the cost for 12 hours work?

var totalCost;

totalCost = function (callOutCharge, costPerHour, numberOfHours) {
    return callOutCharge + costPerHour * numberOfHours;
};

console.log("$" + totalCost(30, 40, 12));  // set numberOfHours to 12

// logs $510

Listing 6.05 - A function with three arguments - Task 2

Add a fourth parameter to the totalCost function definition to account for discounts.

var totalCost;

// include a fourth parameter
totalCost = function (callOutCharge, costPerHour, numberOfHours, discount) {
    return callOutCharge + costPerHour * numberOfHours;
};

console.log("$" + totalCost(30, 40, 3));

Listing 6.05 - A function with three arguments - Task 3

Update the function to subtract the discount from the total before returning it.

var totalCost;

totalCost = function (callOutCharge, costPerHour, numberOfHours, discount) {
    // apply the discount
    return callOutCharge + costPerHour * numberOfHours - discount;
};

console.log("$" + totalCost(30, 40, 3));

Listing 6.05 - A function with three arguments - Task 4

If a customer has a $20 off coupon, update the call to totalCost to display the total cost.

var totalCost;

totalCost = function (callOutCharge, costPerHour, numberOfHours, discount) {
    return callOutCharge + costPerHour * numberOfHours - discount;
};

// apply a $20 discount
console.log("$" + totalCost(30, 40, 3, 20));